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Cuộc Phiêu Lưu Grim của Billy & Mandy - Season 4 Episode 7 (2007)
When Billy finally gets a "secret decoder ring" in his Blasto Bits cereal, he receives a holographic message from a strange creature who speaks about finding the "Secret of the Universe" in an abandoned mine shaft. All the other children of Endsville, also with decoder rings, race to the mine to be the first one to get the Secret. The entire effort is revealed to be a trap laid by Lubbermouth, a worm-like creature from Grim's past, who wishes to free herself from the curse of guarding the Secret. When Mindy looks down at the pit, she becomes the new guardian of the Secret and has to stay there forever.
- Quốc gia : United States of America
- Thể loại : Animation, Comedy, Kids
- Studio : Cartoon Network
- Giám đốc : Maxwell Atoms
- Diễn viên : Greg Eagles, Richard Steven Horvitz, Grey DeLisle, Vanessa Marshall
